Studies on polymer-metal interfaces. 2. Competitive adsorption between oxygen- and nitrogen-containing functionality in model copolymers onto metal surfaces
Dh. Kim et Wh. Jo, Studies on polymer-metal interfaces. 2. Competitive adsorption between oxygen- and nitrogen-containing functionality in model copolymers onto metal surfaces, MACROMOLEC, 33(8), 2000, pp. 3050-3058
The competitive adsorption behavior between oxygen- and nitrogen-containing
functionality in poly(methyl methacrylate-co-2-vinylpyridine) (MMA2VP) and
poly(methyl methacrylate-co-4-vinylpyridine) (MMA4VP) random copolymers on
to alumina substrate was investigated. The adhesive strength of both the MM
A2VP/alumina and MMA4VP/alumina systems increased with increasing vinylpyri
dine (VP) content in the copolymers, and the effect was more prominent for
the MMA4VP/alumina system. Analysis of the reflection-absorption infrared s
pectroscopy shows that the carbonyl functional groups in MMA2VP and MMA4VP
interact specifically with alumina while the pyridine rings in VP units are
oriented more vertically to alumina surface than carbonyl groups. Results
from X-ray photoelectron spectroscopy (XPS) reveal that both the nitrogen-c
ontaining functionalities in 2VP or 4VP units and the oxygen-containing fun
ctionality in MMA unit interact specifically with alumina surface. The quan
titative analysis of XPS spectra indicates that the nitrogen-containing fun
ctionality adsorbs more favorably onto alumina surface than the oxygen-cont
aining functionality for both the MMA2VP/alumina and MMA4VP/alumina systems
.